I use airdroid on my HTC-Legend 2.3.7 with CyanogenMod 7-20121209 nightly
I can't use airdroid with wifi because it's on a different network so I use adb command with usb wire.
Howerer, my phone is connected on the Wifi
adb is installed on my computer (Windows 7 x64)
C:\Windows\system32>adb devices
List of devices attached
HT035NX02049 device

Browser cache and settingsClean the cache or try a different web browser and check if the same issue remains. For best performance we recommend Chrome, Firefox and Safari.I close all my browser and use ccleaner. I use Firefox 17.0.1 and Chrome and it's the same problem (with Opera 12.12 Rev. 1707, there is no login connection form)Edit : oh shit, with IE 9, I can login and use SMS 1 time, after I have the same message:Device not responding. If I deconnect / reconnect, all works fine during 30 seconds only !

ROM and WiFi settings Check if your ROM or WiFi settings disable/limit WiFi connection when screen is off to save power. While WiFi is off AirDroid could not function normally.I check : Parameters>network>Wifi>Menu>Advanced>Wifi sleep policy>Never

Network status. Connection may lost when network is unstable or the signal is too weak. Check if any firewall or VPN settings that might affect the connection.My signal is satisfying